i want a `class AA` with a property `x: Int` and a `class BB` with properties `x: Int` and `y: Int...

# serialization

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i want a class AA with a property x: Int and a class BB with properties x: Int and y: Int where BB inherits from AA (alternative: inner class would be ok too in case thats the only option)

i've tried the snippets below, but no success so far. i checked the guide but couldnt find what i need. how do i make this work?

Untitled_kt.cpp

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i found this solution, but it isn't perfect as i cant do val x: AA = BB(1,2) . is this there a better way ?

Untitled.kt

[andylamax]

open class AA(open val x: Int)

class BB(override val x: Int, val y: Int): AA(x)

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that is exactly my 2nd snippet...